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34 lines
762 B
34 lines
762 B
## Development dependencies
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Sometimes there is a need to have dependencies for tests (or examples, or benchmarks) only. Such dependencies are added to Cargo.toml in the [dev-dependencies] section. These dependencies are not propagated to other packages which depend on this package.
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One such example is using a crate that extends standard assert! macros.
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File Cargo.toml:
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```toml
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# standard crate data is left out
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[dev-dependencies]
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pretty_assertions = "0.4.0"
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```
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File `src/lib.rs`:
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```toml
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// externing crate for test-only use
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#[cfg(test)]
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#[macro_use]
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extern crate pretty_assertions;
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pub fn add(a: i32, b: i32) -> i32 {
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a + b
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_add() {
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assert_eq!(add(2, 3), 5);
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}
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}
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``` |